Function and structure of butterfly valve according to the need of the hydropower station operation and maintenance, in the water diversion system of hydraulic turbine, usually installed in front of the turbine on water diversion pipe or spiral have corresponding valve or valves, and devices in front of the spiral case called fill valve, valve and butterfly valve is a fill valve which are frequently used. Butterfly-valve annular relay mainly by hydraulic device, bypass valve, cylindrical body and between the circuition valve and other parts. In under the action of hydraulic loop relay, when the butterfly Industrial Valves is closed, the circumference of the valve and valve body contact, closed water channel; When open the valve and parallel in the direction of flow, water flow around on both sides of the valve. Compared with other type inlet valve, butterfly valve has the advantages of simple structure, small size, light weight, low cost, convenient operation, the downside is valve affect the flow regime, hydraulic loss is big. In butterfly valve components, hydraulic loop relay is a major part of the operating valve, its work performance is good or bad will directly affect the safe and stable operation of the hydroelectric generating set. The behavior principle butterfly-valve switch valve fully open and close by the rotation of the hydraulic loop relay to complete. Butterfly-valve hydraulic loop relay work motivation mainly comes from hydraulic system, hydraulic operating system with two pressure oil pump, valve, hydraulic valve spool valve and pipelines, etc. Hydraulic loop relay by butterfly-valve spindle, circular cylinder, piston, effect of arm, 1/2 key points of cavity plate and into the oil discharge hole. Butterfly-valve valve and the spindle as a whole, main shaft connected to the role of arm by 1/2 key. Hydraulic loop relay under the action of pressure oil, piston rotating the butterfly-valve axis as the center, along the circular cylinder body movement, and then through the interaction with the piston connection arm driving butterfly valve spindle rotation, the spindle drive the valve, thus achieve the goal of butterfly valves open and close. Butterfly-valve, the process was chosen hydraulic loop relay to operate, because the hydraulic loop relay devices have prominent advantages: doing fixed shaft rotation, can overcome the straight cylinder type relay device transmission function lever shorter starting area and limit area, and make the scattered forces of faults. Annular relay device, however, the relative position, the butterfly valve shaft and cylinder is the center of the circular cylinder with butterfly valve shaft concentricity, circular cylinder body center plane and butterfly valve spindle axis perpendicularity, is in the process of manufacturing and installation is very difficult to guarantee. Switch problems and processing measures in the process of the macro being hydropower plant no. 1, 2 machine butterfly-valve valve diameter is 1. 75 m, rely on two hydraulic loop relay operation. Because the hydraulic loop relay is rigid connection between piston and role of arm, a seal between piston and cylinder, sealing of the main role is to prevent oil cavity pressure oil leak. When operating, hydraulic loop relay piston under the action of pressure oil inside the cylinder body rotation, thus promote the spindle rotation to achieve the purpose of valve open and close. Macro being power plant no. 1, 2 machine butterfly-valve put into production in December 1989, in the process of using hydraulic loop relay when operating butterfly-valve valve often appear some problems, make the valve has been unable to proceed normally open and close and open or close a, is a few minutes, more than 10 minutes, sometimes not can't open or close, such a serious threat to the safe and stable operation of the unit. Through inspection found that the main reason is because the piston and eccentric wear serious, circular cylinder and the diameter of the eccentric wear points corresponding to the gap is bigger. This not only caused great resistance to the piston movement, at the same time in the gap discharge to a large number of oil pressure, spindle and valve force, causing a butterfly-valve phenomenon. Analysis its reason, mainly because of circular cylinder body and the relative position of butterfly valve spindle error is too big lead to serious damage caused by the piston. On butterfly-valve hydraulic loop relay transforming a process, mainly the connection forms of the effect of arm with the piston, are connected by a rigid connection to the elastic, make in the along the circular cylinder, the piston can automatically produce radial displacement, can drive the role of arm, to not be restricted by its rigidity, and can make the manufacture and installation of different heart out-of-tolerance measured for automatic adjustment, improve the working performance of hydraulic loop relay, satisfactory results have been achieved. Due to the limitation of processing, mainly on the piston thrust plate processing. The thrust plate and function of arm shaft and hole, from the original transition fit to cooperate, to ensure that the thrust plate of radial displacement is greater than or equal to 2 mm, still use the role of arm shaft end six M16 screw hole, increase the thrust plate connected to the role of arm; With hole bolt 2 a quasi 20 Φ 30 fit clearance should be less than 2. 5 mm, axial clearance 0. 05 ~ 0. 1 mm to ensure radial piston moves is not blocked, and can make the axial displacement controlled, sealing cover plate 1 and sealing pads 3 consists of screw and thrust plate pressure sealing device. Conclusion butterfly-valve hydraulic loop relay piston after processing by the manual operation test, under no-load condition, butterfly-valve, it's only a 15 s; In the condition of still water, butterfly-valve, a need to 18 ~ 25 s, greatly reducing the time open and close and smooth freely, and butterfly valves open and close process and no leakage or hydraulic loop. Automation system, after the formation of the guide under the condition of water body is out of control, quick and reliable close the butterfly valve, for the safe and stable operation of the unit created favorable conditions.
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